EP0266361B1 - Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion - Google Patents

Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion Download PDF

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Publication number
EP0266361B1
EP0266361B1 EP19870900646 EP87900646A EP0266361B1 EP 0266361 B1 EP0266361 B1 EP 0266361B1 EP 19870900646 EP19870900646 EP 19870900646 EP 87900646 A EP87900646 A EP 87900646A EP 0266361 B1 EP0266361 B1 EP 0266361B1
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EP
European Patent Office
Prior art keywords
spiral
parting line
flat
combustion chamber
sheet metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19870900646
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German (de)
English (en)
Other versions
EP0266361A1 (fr
Inventor
Bernhard Kaczynski
Iwan Komaroff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0266361A1 publication Critical patent/EP0266361A1/fr
Application granted granted Critical
Publication of EP0266361B1 publication Critical patent/EP0266361B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines

Definitions

  • the invention relates to a method for producing a device for injecting fuel into a combustion chamber of an engine according to claim 1.
  • a device for injecting fuel into a combustion chamber of an engine according to claim 1.
  • vaporizing the fuel jet such as from US-A-2 066 860, US-A-1 456 018 and EP-A 0 188 744 known devices an incandescent body downstream of an injection nozzle.
  • These incandescent bodies are produced by winding a round wire or a narrow flat strip into a coil in the form of a conical helix. With these simple incandescent bodies, however, the connection of the power supply conductors to the ends of the filaments requires a great deal of effort.
  • the object of the invention is to provide a method of the type mentioned at the outset, according to which conical incandescent bodies with flat and wide contact surfaces can be produced. This task is solved by the measures indicated in the characterizing part of claim 1.
  • the manufacture of radiators from a flat sheet metal body is known from DE-B-650 676 and that of GB-A-274 560.
  • the sheet metal body is first divided by parallel slits cut alternately from both sides transversely to its longitudinal extent, and then the resulting sections are bent apart to form a spatial zigzag structure.
  • DE-B-650 676 is also pointed out that in the case of helically wound resistance bands, a better utilization of the band surface takes place, but apart from the production of a zigzag structure, no proposal is given for producing a spiral from a flat sheet metal body.
  • the method according to the invention with the characterizing features of claim 1 has the advantage that helical incandescent bodies with reliable contacting and mounting options can be produced with relatively little effort.
  • those materials which are only available as flat material in the form of sheets and strips can also be used as the material for the incandescent body. If the interspaces of the turns are of the same size, the section modulus against flow influences is increased in comparison to heating coils made of round wire
  • the measures contained in the subclaims allow advantageous developments of the method according to claim 1.
  • the shape of the flat strip forming the incandescent body can be maintained extremely precisely if the spiral-shaped separating line is worked into the sheet metal body by means of a laser cut or by etching.
  • a particularly reliable contacting of the incandescent body can be achieved if, according to the method features of claims 4 and 5, a closed contact ring is molded onto the ends of the flat strip forming the incandescent body.
  • the contact rings can advantageously simultaneously serve for centering and for holding the incandescent body to a carrier, which can be designed, for example, as a sleeve supported on the nozzle clamping nut and surrounding the incandescent body with radial play.
  • FIG. 1 shows an enlarged longitudinal section through the end of an injection nozzle on the combustion chamber side and an glow insert integrated in its union nut
  • FIG. 2 shows a top view of the glow plug of the glow insert according to FIG. 1 in an intermediate stage of production.
  • the device has an injection nozzle with a nozzle body 10, in which, as is known, a valve seat is formed and a valve needle is displaceably mounted.
  • the nozzle body 10 and an intermediate disk limiting the stroke of the valve needle are clamped by a union nut 12 to a nozzle holder in which, among other things, a closing spring pressing the valve needle against the valve seat is accommodated.
  • the nozzle body 10 is provided with a conical wall section 14 which merges into a flat end wall 16.
  • the union nut 12 is extended on the combustion chamber side beyond the nozzle holder 10 and is provided downstream of its end wall 16 with an inner support shoulder 18 against which an annealing insert, designated as a whole by the reference number 20, bears.
  • this has a filament 22 designed as a coil, which forms a passage 24 for the spray jets 26.
  • the incandescent body 22 is dimensioned such that the spray jets do not wet the incandescent body, but do produce an injector effect, by means of which air is sucked out of the combustion chamber into the interior of the incandescent body 22 and the peripheral zones of the spray jets passing through the incandescent body.
  • the incandescent body 22 is surrounded by a metallic sleeve 30 which has a flange 32 which rests on the support shoulder 18 of the union nut 12.
  • the sleeve 30 is provided with an inwardly directed annular collar 34, on which the end turn 35 of the incandescent body 22 on the combustion chamber side is supported and soldered, for example.
  • the union nut 12 Downstream of the support shoulder 18, the union nut 12 has an enlarged bore section 36 in an annular collar 38, which surrounds the end of the sleeve 30 and the filament 22 on the combustion chamber in a protective manner.
  • the sleeve 30 is evenly distributed with several Provide holes 40 in the jacket wall, which open into the enlarged bore section 36 of the union nut 12.
  • a first ring-shaped insulating body 44, a metallic contact ring disk 46, a second ring-shaped insulating body 48 and a metallic support disk 50 are superimposed on the sleeve 30. These parts are firmly connected to each other and to the sleeve 30, e.g. centered against each other by soldering, and without further aids, only by correspondingly forming a joining tool when connecting.
  • the upstream end of the incandescent body 22 is soldered to an inner ring zone 52 of the contact ring disk 46, which is provided with a plurality of uniformly distributed openings 54 in the central ring area.
  • the contact ring disk 46 is provided with three raised contact lugs 56 which are offset by 120 ° from one another and are conductively connected to a power supply sleeve 58 which is insulated through the annular gap between the disk body 10 and the union nut 12 up to a higher-lying connection point of an outer supply line extends.
  • a deformed metallic heat protection ring 60 is clamped between the support disk 50 and the nozzle body 10 and presses with an inner ring edge 62 against the end wall 16 of the nozzle body 10.
  • a central ring region 64 of the heat protection ring 60 which is offset axially to the inner ring edge 62, bears against the support disk 50 and an outer ring edge 66 bears against the conical wall section 14 of the nozzle body 10.
  • the heat protection ring 60 is centered on the nozzle body 10 and the passage 24 is properly sealed against the chamber 68 surrounding the heat protection ring 60.
  • annular space 70 is formed which communicates with the combustion chamber via the holes 40 in the sleeve 30 and the enlarged bore section 36 of the union nut 12 connected is.
  • the spray jets 26 suck in air from the combustion chamber by injector action, which, heated on the incandescent body (22), reaches the edge zones of the spray jets and forms an easily flammable fuel-air mixture there.
  • the air entry into the spray jets is made uniform over the entire length of the incandescent body 22 and the insulating bodies 44, 48 or their advertising connection points with the adjacent metallic parts are thermally relieved.
  • the conical design also improves the dynamic behavior of the filament and reduces the risk of breakage.
  • the prefabricated structural unit formed from the parts 22, 30 and 44 to 50 is inserted into the union nut 12 from the upstream side thereof and advanced until it abuts the support shoulder 18.
  • the sleeve 30 can then be glued or soldered or welded to the union nut 12 at a suitable point.
  • the injection nozzle is then expediently installed in such a way that the nozzle holder, the washer and the nozzle body 10 are placed one on top of the other, the heat protection ring 60 is placed on the nozzle body 10, and then the union nut 12 together with the glow insert 20 is put on the parts and screwed onto the nozzle holder, whereby the tensing heat protection ring 60 is kept centered on the nozzle holder 10.
  • the incandescent body 22 is wound from a flat strip 72 (FIG. 2), so that the individual turns have a rectangular cross section.
  • the flat strip 72 is cut out in the form of a spiral from a flat sheet metal body and then pulled apart in the axial direction of the incandescent body 22 to form a conical coil.
  • the spiral can be separated from the flat sheet metal body, for example by etching or also, as shown in Figure 2, done by laser cutting.
  • the flat starting part is a sheet metal strip 74, from which the spiral flat strip 72 is separated by a cutting line 76, which begins at 78 and ends at 80.
  • an inner circular cutting line 82 and an outer circular cutting line 84 are provided, with which the spiral is separated from the sheet metal strip 74.
  • the glow body 22 receives at its ends an inner closed contact ring 86 and an outer closed contact ring 88, with which the glow body 22 is contacted on the contact ring disk 46 and the sleeve 30.
  • the described design of the incandescent body 22 results in flat contact surfaces between the parts to be contacted, which also extend over an entire circumference and therefore enable excellent contacting and fastening.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Spark Plugs (AREA)
  • Laser Beam Processing (AREA)

Abstract

Le dispositif comprend un organe incandescent (22) disposé en aval de la buse d'injection et ayant la forme d'une hélice s'ouvrant coniquement vers la chambre de combustion. L'hélice est constituée d'une bande plate (72) découpée en forme de spirale dans une tôle plate (74) par laser ou à l'acide; ensuite elle est étirée axialement. Cette construction facilite la mise en contact du corps incandescent (22) et présente l'avantage de pouvoir fabriquer l'hélice à partir de matériaux disponibles uniquement en plaques ou bandes planes.

Claims (5)

1. Procédé de production d'un dispositif d'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, avec une buse d'injection (10) et un corps d'injection (22) formé en hélice conique placée après la buse d'injection de l'orifice d'injection, qu'entoure une chambre annulaire (70), qui est en relation avec la chambre de combustion et dont les canaux (40) débouchent sur le chemin des jets d'injection (26), par lesquels les jets d'injection par effet d'injection aspirent l'air de la chambre de combustion, procédé caractérisé en ce que dans un corps de tôle (74) plan on réalise une ligne de séparation (76) en forme de spirale et ensuite on étire le ruban (72) en forme de spirale, restant entre les découpes individuelles de la ligne de séparation (76), pour former une hélice conique et en ce qu'on borde le ruban plat (72) en forme de spirale avec le diamètre externe allant en diminuant constamment vers la buse d'injection (10) et en formant un passage pour les jets injectés (26), sur les pièces entourant l'espace annulaire (70).
2. Procédé selon la revendication 1, caractérisé en ce qu'on réalise la ligne de séparation en forme de spirale (76) par une découpe au laser dans le corps de tôle (74).
3. Procédé selon la revendication 1, caractérisé en ce qu'on réalise la ligne de séparation (76) en forme de spirale par attaque chimique dans le corps de tôle (74).
4. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on sépare du corps de tôle (74) le ruban plat (72) en forme de spirale, restant entre chaque partie de la ligne de séparation (76), par une ligne de séparation (84) circulaire entourant la ligne de séparation en forme de spirale (76) et ainsi on fournit une partie de ruban plane (88) extérieure annulaire assurant le contact.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on relie le début interne du ruban plat (72) en forme de spirale par une ligne de séparation interne circulaire (82) dans le corps de tôle (74) à une partie de ruban plat (86) in terne annulaire servant à fournir le contact.
EP19870900646 1986-05-09 1987-01-14 Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion Expired - Lifetime EP0266361B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863615634 DE3615634A1 (de) 1986-05-09 1986-05-09 Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine
DE3615634 1986-05-09

Publications (2)

Publication Number Publication Date
EP0266361A1 EP0266361A1 (fr) 1988-05-11
EP0266361B1 true EP0266361B1 (fr) 1991-12-18

Family

ID=6300453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900646 Expired - Lifetime EP0266361B1 (fr) 1986-05-09 1987-01-14 Methode de production d'un dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion

Country Status (5)

Country Link
US (1) US4788953A (fr)
EP (1) EP0266361B1 (fr)
JP (1) JPS63503315A (fr)
DE (2) DE3615634A1 (fr)
WO (1) WO1987006977A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609749A1 (de) * 1986-03-22 1987-09-24 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen
US6616066B2 (en) * 2000-01-29 2003-09-09 Daimlerchrysler Ag Injection valve

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1456018A (en) * 1920-07-02 1923-05-22 Edwin L Wiegand Internal-combustion engine
GB274560A (en) * 1926-04-21 1927-07-21 Sydney Charles Lloyd Improvements relating to electrical resistances
US2066860A (en) * 1934-07-02 1937-01-05 Shumake Alton Pump and injector nozzle for diesel engines
DE650676C (de) * 1934-08-31 1937-09-29 Bbc Brown Boveri & Cie Bandheizkoerper fuer elektrische Widerstandsoefen
EP0102507A2 (fr) * 1982-08-14 1984-03-14 Robert Bosch Gmbh Dispositif destiné à l'injection du combustible dans les chambres de combustion des moteurs à combustion interne du type à auto-allumage
DE3307666A1 (de) * 1983-03-04 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeume, insbesondere in brennkammern von dieselmotoren
EP0188746A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne
EP0188743A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne
EP0188744A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne
WO1987006978A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1382697A (fr) * 1964-02-17 1964-12-18 Dispositif d'injection et d'allumage pour moteurs à combustion
JPS5874868A (ja) * 1981-10-29 1983-05-06 Nissan Motor Co Ltd 直接噴射式デイ−ゼルエンジン
GB2131539B (en) * 1982-12-02 1986-04-16 Lucas Ind Plc Electric starting aids for internal combustion engines
DE3315241A1 (de) * 1983-04-27 1984-10-31 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in eine sekundaere stroemung von verbrennungsluft einer brennkammer
DE3327773A1 (de) * 1983-05-13 1984-11-15 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur kraftstoffeinspritzung in brennraeume
DE3414201A1 (de) * 1984-04-14 1985-10-17 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeumen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1456018A (en) * 1920-07-02 1923-05-22 Edwin L Wiegand Internal-combustion engine
GB274560A (en) * 1926-04-21 1927-07-21 Sydney Charles Lloyd Improvements relating to electrical resistances
US2066860A (en) * 1934-07-02 1937-01-05 Shumake Alton Pump and injector nozzle for diesel engines
DE650676C (de) * 1934-08-31 1937-09-29 Bbc Brown Boveri & Cie Bandheizkoerper fuer elektrische Widerstandsoefen
EP0102507A2 (fr) * 1982-08-14 1984-03-14 Robert Bosch Gmbh Dispositif destiné à l'injection du combustible dans les chambres de combustion des moteurs à combustion interne du type à auto-allumage
DE3307666A1 (de) * 1983-03-04 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum einspritzen von kraftstoff in brennraeume, insbesondere in brennkammern von dieselmotoren
EP0188746A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne
EP0188743A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Dispositif d'injection de combustible dans la chambre de combustion d'un moteur à combustion interne
EP0188744A2 (fr) * 1985-01-23 1986-07-30 Robert Bosch Gmbh Injecteur de combustible pour moteurs à combustion interne
WO1987006978A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne

Also Published As

Publication number Publication date
JPS63503315A (ja) 1988-12-02
WO1987006977A1 (fr) 1987-11-19
US4788953A (en) 1988-12-06
EP0266361A1 (fr) 1988-05-11
DE3775345D1 (de) 1992-01-30
DE3615634A1 (de) 1987-11-12

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